Where can a programmer with experience in Delphi/C++/PHP/JS read about the basic concepts of android development?

Question

Android

Everywhere, usually, either details are sucked for experienced or tutorials for general beginners in programming.
And where can I read about all these activities (in Russian - screen / window) / intents, etc. In general, to put together a picture in my head of what and how is arranged in android development and what is the difference from, for example, development for Windows.
How applications work at a low level, is there any analogue of window windows messages, etc.

Answer 1

Before asking, I would look through the off-docs https://developer.android.com/intl/ru/guide/index.html